Here is a script to make a "wind rose 3" in which the area of the central circle is proportional to the frequency of "calm"+"directionless" winds, and the areas of the various colored sectors are proportional to frequency of occurence of that wind. With the area of the central circle having a particular meaning, plotting this windrose requires a bit more than making the radius of the frequency circles proportional to the square root of frequency.
|If this has been done correctly, the area of the white "eye" is 9.3% of the total of the colored area + white eye. Consider the winds from 270o. The area of that petal should be 11% of the total, or slightly more than the eye. The winds from 270o with 15 kts < windspeed < 21 kts (red), has a frequency about 0.02 (because .11-.09=.02). Likewise, the winds from 270o with 3 kts < windspeed < 6 kts (blue-green), has a frequency of about 0.02 (because 0.21-.01=.02). Thus the red and blue-green portions should have the same area, which appears to be the case.|